I find it very frustrating to have the conversation with someone about sulfur allergy when the product for the skin contains colloidal sulfur.  I read on the internet that sulfur allergy is a misnomer and I have been taught by my superiors that an allergy to sulfur is an incorrect assumption, that sulfa allergy is not going to mean sulfur allergy.  Because sulfur is so prevalent in our bodies and is necessary for collagen synth, as well as myriad other functions, is found in cruciferous veggies (hence the potential for gas) and the accolades go on and on.  How do I wade through the muck of these discussions without assuming sulfur is not the culprit or assuming sulfur is definitely suspicious? 

People have adverse reactions to nitrites and nitrates and nitrous oxide will get you high.  Is it fair to assume an allergy or sensitivity to nitrogen when our atmosphere is 82% nitrogen?   We can't just go around announcing and pronouncing, eventually denouncing without adequate information.  And what I find is inadequate. 

When it comes to sulfur masks, for example, I learned that the molecular structure is too large and that the mask will only act where it is in contact with the skin, thus a saponification.  But for an allergy to take place, it would have to be a smaller molecule that would interact at the cellular level. 

I want solid info that I can stand on when discussing this ingredient with clients and colleagues.

Thank you!